Purple Unicorn is a term used to describe a candidate profile that possesses the skills and experiences that are believed to be so rare, they are almost mythical. They meet all the requirements for the job and can do the job with no questions asked. Finding a purple unicorn is a very difficult task. Purple Unicorns are maybe Pink (passive candidate) or they may have wings (active candidate).
Pink unicorns are preferred as they are likely happy, engaged, and productive yet elusive employees who are likely open to new activities but haven’t made a substantial time commitment investing in looking for a job. Pink unicorns are not looking for a new job.